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Need helP on discus behavior.

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Ever since I planted my aquarium and added co my dominant discus has been stretching his fins like sails infront of the other discus. Also the others have started pecking eachother. What is wrong with my discus? My ph is around 6.2-6.4. Nitrites close to zero. Ammonia is zero. Temp is 29 celcius. Could it be the beginning of a breeding couple!??

Even though they cannot compare with green terrors or jack dempseys, your discus still are cichlids. Fin flaring is a way to look bigger and intimidate or impress other discus. Pecking at one another is a way fish establish a hierarchy.
Nothing is wrong with your fish. A breeding pair will hang out together and direct their aggression at other fish.

+1 to madagascariensis, they're just reestablishing the pecking order, this is fairly common after changing the aquascape. Keep an eye on the pecking to ensure it doesn't get out of control, your parameters are perfect.

By changing the tank, the fish are recreating their territories so some aggression is normal.

Knowledge is fun(damental)

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.

And my most dominant keeps sailing and going verticle against the only known female I have in my tank. No slapping just trying to look big, but she is one of, or is the smallest so I don't know why he is not doing it to the other large male?

If the male is 'shivering' at times while doing this, the male could be trying to encourage the female to pair bound.

Knowledge is fun(damental)

A 75 gal with eight Discus, fake plants, and a lot of wood also with sand substrate. Clean up crew is down to just two Sterba's Corys. Filters: continuous new water flow; canister w/UV, in-tank algae scrubber!! Finally, junked the nitrate removal unit from hell.